Submitted on: 06 December 1999.
Revised on: 18 December 1999.
Accepted on: 02 January 2000.
Physica Status Solidi-Rapid Research Letters
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Submitted on: 29 October 2007.
Revised on: 11 December 2007.
Accepted on: 30 December 2007.
Physica Status Solidi-Rapid Research Letters
Submitted on: 29 January 2019.
Revised on: 12 February 2019.
Accepted on: 09 March 2019.
Physica Status Solidi-Rapid Research Letters
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Submitted on: 15 July 2016.
Revised on: 23 August 2016.
Accepted on: 30 August 2016.
Physica Status Solidi-Rapid Research Letters
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